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Title: Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO 3

Abstract

NaOsO3 undergoes a metal-insulator transition (MIT) at 410 K, concomitant with the onset of antiferromagnetic order. The excitation spectra have been investigated through the MIT by resonant inelastic x-ray scattering (RIXS) at the Os L3 edge. Low resolution (ΔE ~ 300 meV) measurements over a wide range of energies reveal that local electronic excitations do not change appreciably through the MIT. This is consistent with a picture in which structural distortions do not drive the MIT. In contrast, high resolution (ΔE ~ 56 meV) measurements show that the well-defined, low-energy magnons in the insulating state weaken and dampen upon approaching the metallic state. Concomitantly, a broad continuum of excitations develops which is well described by the magnetic fluctuations of a nearly antiferromagnetic Fermi liquid. By revealing the continuous evolution of the magnetic quasiparticle spectrum as it changes its character from itinerant to localized, our results provide unprecedented insight into the nature of the MIT in NaOsO3. In particular, the presence of weak correlations in the paramagnetic phase implies a degree of departure from the ideal Slater limit.

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9]; ORCiD logo [10];  [3]
  1. Univ. College London, London (United Kingdom). London Centre for Nanotechnology and Dept. of Physics and Astronomy; Ecole Polytechnique Federale Lausanne (Switzlerland). Lab. for Quantum Magnetism
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. Univ. College London, London (United Kingdom). London Centre for Nanotechnology and Dept. of Physics and Astronomy
  4. Univ. College London, London (United Kingdom). London Centre for Nanotechnology and Dept. of Physics and Astronomy; Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  5. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and Inst. of Physics; National Inst. for Materials Science (NIMS), Tsukuba (Japan). Research Center for Functional Materials
  6. National Inst. for Materials Science (NIMS), Tsukuba (Japan). Research Center for Functional Materials
  7. National Inst. for Materials Science (NIMS), Tsukuba (Japan). Research Center for Functional Materials; Hokkaido Univ., Sapporo (Japan). Graduate School of Chemical Sciences and Engineering
  8. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  9. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  10. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1462864
Alternate Identifier(s):
OSTI ID: 1439519
Grant/Contract Number:  
AC05-00OR22725; EP/N027671/1; EP/N034872/1; 15K14133; 16H04501; 11774399; 11474330
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Vale, James G., Calder, Stuart A., Donnerer, Christian, Pincini, D., Shi, Y.G., Tsujimoto, Y., Yamaura, K., Moretti Sala, M., van den brink, J, Christianson, Andrew D., and McMorrow, D. F. Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.184429.
Vale, James G., Calder, Stuart A., Donnerer, Christian, Pincini, D., Shi, Y.G., Tsujimoto, Y., Yamaura, K., Moretti Sala, M., van den brink, J, Christianson, Andrew D., & McMorrow, D. F. Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3. United States. doi:10.1103/PhysRevB.97.184429.
Vale, James G., Calder, Stuart A., Donnerer, Christian, Pincini, D., Shi, Y.G., Tsujimoto, Y., Yamaura, K., Moretti Sala, M., van den brink, J, Christianson, Andrew D., and McMorrow, D. F. Wed . "Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3". United States. doi:10.1103/PhysRevB.97.184429. https://www.osti.gov/servlets/purl/1462864.
@article{osti_1462864,
title = {Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3},
author = {Vale, James G. and Calder, Stuart A. and Donnerer, Christian and Pincini, D. and Shi, Y.G. and Tsujimoto, Y. and Yamaura, K. and Moretti Sala, M. and van den brink, J and Christianson, Andrew D. and McMorrow, D. F.},
abstractNote = {NaOsO3 undergoes a metal-insulator transition (MIT) at 410 K, concomitant with the onset of antiferromagnetic order. The excitation spectra have been investigated through the MIT by resonant inelastic x-ray scattering (RIXS) at the Os L3 edge. Low resolution (ΔE ~ 300 meV) measurements over a wide range of energies reveal that local electronic excitations do not change appreciably through the MIT. This is consistent with a picture in which structural distortions do not drive the MIT. In contrast, high resolution (ΔE ~ 56 meV) measurements show that the well-defined, low-energy magnons in the insulating state weaken and dampen upon approaching the metallic state. Concomitantly, a broad continuum of excitations develops which is well described by the magnetic fluctuations of a nearly antiferromagnetic Fermi liquid. By revealing the continuous evolution of the magnetic quasiparticle spectrum as it changes its character from itinerant to localized, our results provide unprecedented insight into the nature of the MIT in NaOsO3. In particular, the presence of weak correlations in the paramagnetic phase implies a degree of departure from the ideal Slater limit.},
doi = {10.1103/PhysRevB.97.184429},
journal = {Physical Review B},
number = 18,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}

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